End of May? So, you're going to VNEA? Was there last year. Unfortunately, there were only about 10 vendors, that includes the repair booths. Kinda sparse.
IMHO, the BCAPL Nat'ls are way better on a number of levels including vendors. They have vendors lining the entire perimeter of the main room, and half a dozen in the second room. Plus, there's about 8 repair booths in a separate room with the "practice" tables (aka "action" tables).
I know this doesn't help you for this year, but maybe next year. Then again, BCAPL switched to the end of July in 2013 (WTF?!?), so maybe not.